Why we use use strict?

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Tags

1. #purpose
2. #literal
3. #earlier
4. #ignored
5. #indicate
6. #undeclared
7. #javascript
8. #example
9. #strict
10. #version
11. #versions
12. #ecmascript
13. #statement
14. #expression
15. #variables
16. #should
17. #executed
18. #directive